Since I'm having a hard time locating some K180 tires to fit these rims, I'm contemplating lacing up some new ones. I like spokes anyway. I do have a few calls and emails in to Dunlop/Goodyear.
Anyway, I'm thinking some Honda dirt bike (CR XR) hubs and lacing them to some 19" hoops - F&R. I think I'll use the new Shinko flat track tires as they are pretty inexpensive, readily available, and DOT legal.
Hopefully, all that I'll have to do is machine a carrier for the brake discs & sprocket/disc. I could fit an MX swingarm, but I'm pretty sure the stock swinger would be fine.
I think I want different forks too. Still researching that. Seems like I have opened a can of worms.
Stay tuned.